Perhaps you should try some spelling variations:
van thanh » ban thanh, van tuan
pham duy » pham duc
vu khach » vu khanh, vu khac, vay khach
thanh vi » hanh vi, thanh va, thanh ve
vu sach » vu bach, su sach
cua tre » cua te, cua triet, dua tren
duy van » duy vat, dung van
va pham » van pham, va phat, va phap
hieu va » lieu va, hieu qua
nang ma » tang ma, sang ma, nang cao
ty nang » ky nang, ty xang, ty hang
cuu tre » cau tren, cau treo
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: ((vu sach) or (vu khach)) ty nang ma hoi. hieu va pham duy van thanh vi ((cua tre) or (cuu tre))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((vu sach) OR (vu khach)) ty nang ma hoi. hieu va pham duy van thanh vi ((cua tre) OR (cuu tre)).
• Adding a wildcard symbol may retrieve word variants: ((vu sach) or (vu khach)) ty nang ma hoi. hieu va pham duy van thanh vi ((cua tre) or (cuu tre))*.