Perhaps you should try some spelling variations:
thien van » thi van
hieu van » hieu va, lieu va, hieu ve
su sach » so sach, vu sach
va danh » va dinh, va dan, va hanh
cam luc » cam xuc, cau luc
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
luc va » duc va, tuc va, loc va
x hoi » xa hoi, o hoi, x ho
vi du » vi dum, va du, ve du
vi su » va su, ve su, ki su

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 ty nang x hoi. ((hieu van) or (thien van)) cam luc va danh ((vi du) or (vi su)) tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang x hoi. ((hieu van) OR (thien van)) cam luc va danh ((vi du) OR (vi su)) tren.
• Adding a wildcard symbol may retrieve word variants: su sach ty nang x hoi. ((hieu van) or (thien van)) cam luc va danh ((vi du) or (vi su)) tren*.