Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
va thanh » gia thanh, ban thanh, va tinh
va hanh » van hanh, va danh, ban hanh
sach ky » sac ky, sach y, sach ty
te sach » toc sach
qua hai » qua hoat
ky lang » ky nang, ky dang, ky tang
hai xuc » hai cuc, hai xu, chat xuc
ha hoi » hoa hoi, xa hoi, va hoi
vai su » va su, van su, lai su

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 lang ((ha hoi) OR (ha noi)). hieu qua hai xuc ((va thanh) or (va hanh)) vai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ky lang ((ha hoi) OR (ha noi)). hieu qua hai xuc ((va thanh) OR (va hanh)) vai su triet.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sach ky lang ((ha hoi) OR (ha noi)). hieu qua hai xuc ((va thanh) or (va hanh)) vai su triet".
• Adding a wildcard symbol may retrieve word variants: te sach ky lang ((ha hoi) OR (ha noi)). hieu qua hai xuc ((va thanh) or (va hanh)) vai su triet*.