Perhaps you should try some spelling variations:
sanh thien » sach thieu, hanh thiet, manh tien
thien nang » thien bang, thien dang, trien nang
kham chua » kham pha
hieu van » thien van, lieu va, hieu ve
hanh lai » hanh lam, hanh tai, thanh lap
so sanh » do sanh
nang ma » tang ma, sang ma, nang cao
hieu va » lieu va, hieu qua
chua va » chuc va, chua may, chuan ha
va hanh » van hanh, va thanh, va danh
lai cua » dai cua, hai cua, lai chau
ma hoi » mai hoi, xa hoi, ma hoa
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: so sanh thien nang ma hoi. ((hieu van) or (hieu va)) kham chua va hanh lai cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: so sanh thien nang ma hoi. ((hieu van) OR (hieu va)) kham chua va hanh lai cua te.
• Adding a wildcard symbol may retrieve word variants: so sanh thien nang ma hoi. ((hieu van) or (hieu va)) kham chua va hanh lai cua te*.