Perhaps you should try some spelling variations:
nam duoc » nam thuoc, da duoc, dat duoc
va gianh » va gian, van giang, va thanh
tang mai » tang ma, tang tai, lang mai
lai cua » dai cua, hai cua, lai chau
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
mai hoi » mai khoi, dai hoi, lai hoi
ky tang » ky nang, ky dang, kho tang
sac ky » cac ky, sai ky
te sac » te sach, te cac, te san

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

• Performing a fuzzy search may retrieve terms with similar spellings: te sac ky tang mai hoi. hieu va ((nam duoc) or (cam xuc)) ((va gianh) OR (va giai)) lai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: te sac ky tang mai hoi. hieu va ((nam duoc) OR (cam xuc)) ((va gianh) OR (va giai)) lai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "te sac ky tang mai hoi. hieu va ((nam duoc) or (cam xuc)) ((va gianh) OR (va giai)) lai cua tre".
• Adding a wildcard symbol may retrieve word variants: te sac ky tang mai hoi. hieu va ((nam duoc) or (cam xuc)) ((va gianh) OR (va giai)) lai cua tre*.