Perhaps you should try some spelling variations:
thanh dat » thanh san, thanh hai, thanh van
cua viet » ca viet, hoa viet, cua vat
sua viet » su viet, lua viet, qua viet
hanh tai » thanh tai, hang tai, han tai
sach ky » sac ky, sach y, sach ty
te sach » toc sach
cam tuc » cam xuc, cam tu, nam thuc
hieu va » lieu va, hieu qua
tang xa » trang xa, tang ma, lang xa
ky tang » ky nang, ky dang, kho tang
tuc va » thuc va, truc va, tuc xa
va cam » va cham, va cac, va cao

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sach ky tang xa hoi. hieu va cam tuc va ((hanh tai) or (thanh dat)) ((sua viet) OR (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky tang xa hoi. hieu va cam tuc va ((hanh tai) OR (thanh dat)) ((sua viet) OR (cua viet)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky tang xa hoi. hieu va cam tuc va ((hanh tai) or (thanh dat)) ((sua viet) OR (cua viet))".
• Adding a wildcard symbol may retrieve word variants: te sach ky tang xa hoi. hieu va cam tuc va ((hanh tai) or (thanh dat)) ((sua viet) OR (cua viet))*.