Perhaps you should try some spelling variations:
thuc dan » thuc hanh, hoc dan, thuc vat
cua viet » ca viet, hoa viet, cua vat
su sach » so sach, vu sach
nang ma » tang ma, sang ma, nang cao
hieu ve » hieu va, hieu van
truc va » thuc va, thuc vat, trung va
hanh di » hanh vi, hanh de, hang di
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
ve cam » ve cham, ve cac, va cam
di cua » dai cua, doi cua, de cua

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 y nang ma hoi. hieu ve cam ((truc va) or (thuc dan)) hanh di cua viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang ma hoi. hieu ve cam ((truc va) OR (thuc dan)) hanh di cua viet.
• Adding a wildcard symbol may retrieve word variants: su sach y nang ma hoi. hieu ve cam ((truc va) or (thuc dan)) hanh di cua viet*.