Perhaps you should try some spelling variations:
nang van » dang van, lang van, nong van
tang van » dang van, hoang van, trong van
sach ky » sac ky, sach y, sach ty
va hanh » van hanh, va thanh, va danh
nam xuc » cam xuc, nam xua, nam thuc
su sach » so sach, vu sach
hieu va » lieu va, hieu qua
xuc va » duc va, tuc va, luc va
va nam » van nam, ha nam, va nay
vi su » va su, ve su, oi su
ki su » ky 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 ky ((nang van) or (tang van)) hoi. hieu va nam xuc va hanh ((vi su) OR (ki su)) triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ky ((nang van) OR (tang van)) hoi. hieu va nam xuc va hanh ((vi su) OR (ki su)) triet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "su sach ky ((nang van) or (tang van)) hoi. hieu va nam xuc va hanh ((vi su) OR (ki su)) triet*".