Perhaps you should try some spelling variations:
tham thuc » nham thuc, pham thuc, tam thuc
hieu van » hieu va, thien van, lieu va
hang doi » hang di, hang loi, huong doi
cham tuc » nham thuc, pham thuc, cham soc
doi cua » dai cua, hoi cua
va hang » van hang, va nang, va lang
te sach » toc sach
sach ly » sach y, sach lo, sach ty
mai hoi » mai khoi, dai hoi, lai hoi
ly nang » ky nang, ly hang, ly vang
cua tre » cua te, cuu tre, cua triet
ma hoi » xa hoi, ma hoa, me hoi

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 ly nang ((ma hoi) or (mai hoi)). hieu van ((cham tuc) or (tham thuc)) va hang doi cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sach ly nang ((ma hoi) OR (mai hoi)). hieu van ((cham tuc) OR (tham thuc)) va hang doi cua tre.
• Adding a wildcard symbol may retrieve word variants: te sach ly nang ((ma hoi) or (mai hoi)). hieu van ((cham tuc) or (tham thuc)) va hang doi cua tre*.