Perhaps you should try some spelling variations:
vu khach » vu khanh, vu khac, vay khach
luat tuc » luat thue
hieu van » hieu va, thien van, lieu va
su sach » so sach, vu sach
lam tuc » lam thuoc, lam truoc, nam thuc
danh vu » danh tu, anh vu, danh du
va danh » va dinh, va dan, va hanh
lang xa » lang ha, dang xay, lang van
y lang » o lang, _ lang, tay lang
vu va » vu van, tu va, su 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 khach)) y lang xa hoi. hieu van ((lam tuc) OR (luat tuc)) va danh vu va thiet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: ((su sach) OR (vu khach)) y lang xa hoi. hieu van ((lam tuc) OR (luat tuc)) va danh vu va thiet*.
• The words AND, OR and NOT may confuse the search; try adding quotes: "((su sach) or (vu khach)) y lang xa hoi. hieu van ((lam tuc) OR (luat tuc)) va danh vu va thiet*".