Perhaps you should try some spelling variations:
sach tham » sach nha
phap thuc » phap thu, phap hoc, phap tu
va thanh » gia thanh, ban thanh, va tinh
va hanh » van hanh, va danh, ban hanh
vai cua » dai cua, hai cua, lai cua
nang ma » tang ma, sang ma, nang cao
v phap » va phap, ve phap, v pham
hieu v » hieu va, hieu ve, hieu 2
ma hoi » mai hoi, xa hoi, ma hoa
cua tu » cua tuc, cua su, cua cu

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

• Performing a fuzzy search may retrieve terms with similar spellings: so ((sach thieu) or (sach tham)) nang ma hoi. hieu v phap thuc ((va hanh) OR (va thanh)) vai cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so ((sach thieu) OR (sach tham)) nang ma hoi. hieu v phap thuc ((va hanh) OR (va thanh)) vai cua tu.
• The words AND, OR and NOT may confuse the search; try adding quotes: "so ((sach thieu) or (sach tham)) nang ma hoi. hieu v phap thuc ((va hanh) OR (va thanh)) vai cua tu".
• Adding a wildcard symbol may retrieve word variants: so ((sach thieu) or (sach tham)) nang ma hoi. hieu v phap thuc ((va hanh) OR (va thanh)) vai cua tu*.