Perhaps you should try some spelling variations:
ban thanh » ban hanh, ban hang
hieu van » hieu va, thien van, lieu va
va hanh » van hanh, va thanh, va danh
lam xuc » cam xuc, lam duoc
van lam » van nam
sach ty » sach y, sach tu, sach thu
nang xa » nang x, lang xa, nang ma
su tren » su tien, tu tren, cu tren
sac ky » cac ky, sai ky
vi su » va su, ve su, ki 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) or (sac ky)) nang xa hoi. hieu van lam xuc ((va hanh) or (ban thanh)) vi su tren~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu ((sach ty) OR (sac ky)) nang xa hoi. hieu van lam xuc ((va hanh) OR (ban thanh)) vi su tren.
• Adding a wildcard symbol may retrieve word variants: tu ((sach ty) or (sac ky)) nang xa hoi. hieu van lam xuc ((va hanh) or (ban thanh)) vi su tren*.