Perhaps you should try some spelling variations:
vat thanh » dat thanh, gat thanh, tat thanh
than cua » nhan cua, thai cua, ban cua
phan cua » nhan cua, phat cua, han cua
pham duy » pham duc
te sach » toc sach
va pham » van pham, va phat, va phap
hieu va » lieu va, hieu qua
mai hoi » mai khoi, dai hoi, lai hoi
sach v » sach va, sach y, sach 2
ma hoi » xa hoi, ma hoa, me hoi
v nang » va nang, vu nang, van nang

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 v nang ((ma hoi) or (mai hoi)). hieu va pham duy vat thanh ((phan cua) OR (than cua)) te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach v nang ((ma hoi) OR (mai hoi)). hieu va pham duy vat thanh ((phan cua) OR (than cua)) te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach v nang ((ma hoi) or (mai hoi)). hieu va pham duy vat thanh ((phan cua) OR (than cua)) te".
• Adding a wildcard symbol may retrieve word variants: te sach v nang ((ma hoi) or (mai hoi)). hieu va pham duy vat thanh ((phan cua) OR (than cua)) te*.