Perhaps you should try some spelling variations:
hieu quan » lieu quan, thien quan, lien quan
chat truc » cau truc, chat xuc
thu san » thuy san, thu ban, phu san
truc va » thuc va, thuc vat, trung va
dan dai » dat dai, can dai, dan dat
cua tre » cua te, cuu tre, cua triet
san ky » sang ky, van ky, dan ky
va dan » ca dan, va dao, va dau

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu san ky nang x ho. ((hieu quan) or (hieu qua)) chat truc va dan dai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu san ky nang x ho. ((hieu quan) OR (hieu qua)) chat truc va dan dai cua tre.
• Adding a wildcard symbol may retrieve word variants: thu san ky nang x ho. ((hieu quan) or (hieu qua)) chat truc va dan dai cua tre*.