Perhaps you should try some spelling variations:
thien van » thi van
hieu van » hieu va, lieu va, hieu ve
nam truc » nam truoc, nam thuc, nam trung
su sach » so sach, vu sach
nang ma » tang ma, sang ma, nang cao
truc xa » tuc xa, truc va, truoc xay
xa hanh » xa thanh, xa khanh, va hanh
y nang » ky nang, ly nang, v nang
ma hoi » mai hoi, xa hoi, ma hoa
vi cua » vai cua, di cua
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: su sach y nang ma hoi. ((hieu van) or (thien van)) nam truc xa hanh vi cua tu~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach y nang ma hoi. ((hieu van) OR (thien van)) nam truc xa hanh vi cua tu.
• Adding a wildcard symbol may retrieve word variants: su sach y nang ma hoi. ((hieu van) or (thien van)) nam truc xa hanh vi cua tu*.