Perhaps you should try some spelling variations:
phap thuc » phap thu, phap hoc, phap tu
tham thuc » nham thuc, pham thuc, tam thuc
su sach » so sach, vu sach
sach ky » sac ky, sach y, sach ty
ky tang » ky nang, ky dang, kho tang
tang xa » trang xa, tang ma, lang xa
va hanh » van hanh, va thanh, va danh
hanh ve » hanh vi, hanh va, hanh kem
ve cua » le cua, de cua, te cua
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: su sach ky tang xa hoi. lieu va ((tham thuc) or (phap thuc)) va hanh ve cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky tang xa hoi. lieu va ((tham thuc) OR (phap thuc)) va hanh ve cua te.
• Adding a wildcard symbol may retrieve word variants: su sach ky tang xa hoi. lieu va ((tham thuc) or (phap thuc)) va hanh ve cua te*.