Perhaps you should try some spelling variations:
thanh tai » thanh toan, doanh tai, thanh san
thanh hai » thanh phan, thanh hoa, thanh san
thu nang » thi nang, thu hang, thu bang
phan luc » nhan luc, phan duc, phan suc
sach thu » sach thue, sach thieu, sach tham
cua tre » cua te, cua triet, dua tren
vu sach » vu bach, su sach, vu khach
va phan » van phan, va phat, va phap
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
cuu tre » cau tren, cau treo
luc va » duc va, tuc va, loc va

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach thu nang ma hoa. hieu va phan luc va ((thanh hai) or (thanh tai)) ((cua tre) OR (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach thu nang ma hoa. hieu va phan luc va ((thanh hai) OR (thanh tai)) ((cua tre) OR (cuu tre)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach thu nang ma hoa. hieu va phan luc va ((thanh hai) or (thanh tai)) ((cua tre) OR (cuu tre))".
• Adding a wildcard symbol may retrieve word variants: vu sach thu nang ma hoa. hieu va phan luc va ((thanh hai) or (thanh tai)) ((cua tre) OR (cuu tre))*.