Perhaps you should try some spelling variations:
hieu van » hieu va, thien van, lieu va
va thanh » gia thanh, ban thanh, va tinh
lam duoc » nam duoc, luat duoc, lam thuoc
dang ky » dang y, dan ky, dong ky
van lam » van nam
tang ky » trong ky, tang khu
va hanh » van hanh, va danh, ban hanh
vai cua » dai cua, hai cua, lai cua
cua tre » cua te, cuu tre, cua triet

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu ((tang ky) OR (dang ky)) nang x ho. hieu van lam duoc ((va hanh) or (va thanh)) vai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu ((tang ky) OR (dang ky)) nang x ho. hieu van lam duoc ((va hanh) OR (va thanh)) vai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thu ((tang ky) OR (dang ky)) nang x ho. hieu van lam duoc ((va hanh) or (va thanh)) vai cua tre".
• Adding a wildcard symbol may retrieve word variants: thu ((tang ky) OR (dang ky)) nang x ho. hieu van lam duoc ((va hanh) or (va thanh)) vai cua tre*.