Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
su sach » so sach
vu sach » vu bach, vu khach
lang xa » lang ha, dang xay, lang van
cam tuc » cam tu, nam thuc, dam thuc
va hanh » van hanh, va thanh, va danh
y lang » o lang, _ lang, tay lang
vi va » vi van, vai va, vu va
thiet* » thieu*

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) or (vu sach)) y lang xa hoi. hieu van ((cam tuc) OR (cam xuc)) va hanh vi va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu sach)) y lang xa hoi. hieu van ((cam tuc) OR (cam xuc)) va hanh vi va thiet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu sach)) y lang xa hoi. hieu van ((cam tuc) OR (cam xuc)) va hanh vi va thiet*".