Perhaps you should try some spelling variations:
thu lang » thu hang, phu lang, tho lang
thu bang » thu ban, thu hang, chu bang
vu sach » vu bach, su sach, vu khach
cac tuc » cac toc, cac tu, cac tac
hieu va » lieu va, hieu qua
cua tuc » cua duc, cua tu, cua thuoc
tuc va » thuc va, truc va, tuc xa
va dan » ca dan, va dao, va dau
dan vi » doan vi, don vi, dan va
cua te » cua tu

You may be able to get more results by adjusting your search query.

• Performing a fuzzy search may retrieve terms with similar spellings: vu sach ((thu lang) OR (thu bang)) xa hoi. hieu va cac tuc va dan vi ((cua te) or (cua tuc))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: vu sach ((thu lang) OR (thu bang)) xa hoi. hieu va cac tuc va dan vi ((cua te) OR (cua tuc)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "vu sach ((thu lang) OR (thu bang)) xa hoi. hieu va cac tuc va dan vi ((cua te) or (cua tuc))".
• Adding a wildcard symbol may retrieve word variants: vu sach ((thu lang) OR (thu bang)) xa hoi. hieu va cac tuc va dan vi ((cua te) or (cua tuc))*.