Perhaps you should try some spelling variations:
pham thuc » phap thuc, pham chuc, nham thuc
hanh dai » hanh tai, hanh dao, vanh dai
van hanh » van thanh, ban hanh, van anh
thuc van » thuc vat, thuc dan, thuc va
va trien » va truyen, va thiet, va tuyen
sach thu » sach thue, sach thieu, sach tham
sach ky » sac ky, sach y, sach kem
hieu vi » hieu voi, hieu va, hieu ve
sach ty » sach y, sach tu, xach tay
nang xa » nang x, lang xa, nang ma
dai va » mai va

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

• Performing a fuzzy search may retrieve terms with similar spellings: hoc ((sach ky) or (((sach ty) OR (sach thu)))) nang xa hoi. hieu vi pham thuc van hanh dai va trien~.
• If you are trying to use Boolean operators, they must be ALL CAPS: hoc ((sach ky) OR (((sach ty) OR (sach thu)))) nang xa hoi. hieu vi pham thuc van hanh dai va trien.
• The words AND, OR and NOT may confuse the search; try adding quotes: "hoc ((sach ky) or (((sach ty) OR (sach thu)))) nang xa hoi. hieu vi pham thuc van hanh dai va trien".
• Adding a wildcard symbol may retrieve word variants: hoc ((sach ky) or (((sach ty) OR (sach thu)))) nang xa hoi. hieu vi pham thuc van hanh dai va trien*.