Perhaps you should try some spelling variations:
dung tren » dung trong, dung trung
thanh lap » thanh san, phan lap, thanh hai
cau tren » cu tren, dau tren, ca tren
va thanh » gia thanh, ban thanh, va tinh
sach ty » sach y, sach tu, sach thu
te sach » toc sach
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
hieu va » lieu va, hieu qua
hieu v » hieu ve, hieu 2, hieu _
ma hoi » mai hoi, xa hoi, ma hoa

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ty nang ma hoi. ((hieu v) OR (hieu va)) pham duc va thanh lap ((dung tren) or (cau tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ty nang ma hoi. ((hieu v) OR (hieu va)) pham duc va thanh lap ((dung tren) OR (cau tren)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ty nang ma hoi. ((hieu v) OR (hieu va)) pham duc va thanh lap ((dung tren) or (cau tren))".
• Adding a wildcard symbol may retrieve word variants: te sach ty nang ma hoi. ((hieu v) OR (hieu va)) pham duc va thanh lap ((dung tren) or (cau tren))*.