Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
tu sach » thu sach, su sach, te sach
hai cua » thai cua, dai cua, hoi cua
va hanh » van hanh, va thanh, va danh
va lanh » va lang, va danh, va anh
lam xuc » cam xuc, lam duoc
sach ty » sach y, sach tu, sach thu
van lam » van nam
nang ma » tang ma, sang ma, nang cao
nang xa » nang x, lang xa, mang xa
cua su » qua 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 ty ((nang xa) or (nang ma)) hoi. hieu van lam xuc ((va lanh) OR (va hanh)) hai cua su~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ty ((nang xa) OR (nang ma)) hoi. hieu van lam xuc ((va lanh) OR (va hanh)) hai cua su.
• The words AND, OR and NOT may confuse the search; try adding quotes: "tu sach ty ((nang xa) or (nang ma)) hoi. hieu van lam xuc ((va lanh) OR (va hanh)) hai cua su".
• Adding a wildcard symbol may retrieve word variants: tu sach ty ((nang xa) or (nang ma)) hoi. hieu van lam xuc ((va lanh) OR (va hanh)) hai cua su*.