Perhaps you should try some spelling variations:
hieu van » thien van, lieu va, hieu ve
van hanh » van thanh, ban hanh, van anh
tu sach » thu sach, su sach, te sach
lang xa » lang ha, dang xay, lang van
hieu va » lieu va, hieu qua
cau xuc » cam xuc, cau luc, cau truc
va danh » va dinh, va dan, va hanh
su viet » so viet
y lang » o lang, _ lang, tay lang
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: tu sach y lang xa hoi. ((hieu van) or (hieu va)) cau xuc ((va danh) or (van hanh)) ki su viet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach y lang xa hoi. ((hieu van) OR (hieu va)) cau xuc ((va danh) OR (van hanh)) ki su viet.
• Adding a wildcard symbol may retrieve word variants: tu sach y lang xa hoi. ((hieu van) or (hieu va)) cau xuc ((va danh) or (van hanh)) ki su viet*.