Perhaps you should try some spelling variations:
thuat lanh » thuat lap, thuat san
tang mai » tang ma, tang tai, lang mai
hieu van » hieu va, thien van, lieu va
tinh tai » trinh tai, tinh thai, tinh hai
va tinh » may tinh
cua tre » cuu tre, cua triet, dua tren
mai hoi » mai khoi, dai hoi, lai hoi
cua te » cua tu
cam lo » nam lo, cam ly, cam o
lanh y » anh y, hanh y, lanh lay
y tang » ky tang, 6 tang, 7 tang

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

• Performing a fuzzy search may retrieve terms with similar spellings: thuat lanh y tang mai hoi. hieu van ((cham h'roi) or (cam lo)) va tinh tai ((cua tre) OR (cua te))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat lanh y tang mai hoi. hieu van ((cham h'roi) OR (cam lo)) va tinh tai ((cua tre) OR (cua te)).
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat lanh y tang mai hoi. hieu van ((cham h'roi) or (cam lo)) va tinh tai ((cua tre) OR (cua te))".
• Adding a wildcard symbol may retrieve word variants: thuat lanh y tang mai hoi. hieu van ((cham h'roi) or (cam lo)) va tinh tai ((cua tre) OR (cua te))*.