Perhaps you should try some spelling variations:
thuat lanh » thuat lap, thuat san
tinh tai » trinh tai, tinh thai, tinh hai
hieu van » hieu va, thien van, lieu va
mai hoi » mai khoi, dai hoi, lai hoi
ky tang » ky nang, ky dang, kho tang
va tinh » may tinh
tai cua » thai cua, tai cuc, tri cua
cua tre » cua te, cuu tre, cua triet
cam lo » nam lo, cam ly, cam o
y tang » 6 tang, 7 tang, 5 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) OR (ky tang)) mai hoi. hieu van ((cham h'roi) or (cam lo)) va tinh tai cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat lanh ((y tang) OR (ky tang)) mai hoi. hieu van ((cham h'roi) OR (cam lo)) va tinh tai cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat lanh ((y tang) OR (ky tang)) mai hoi. hieu van ((cham h'roi) or (cam lo)) va tinh tai cua tre".
• Adding a wildcard symbol may retrieve word variants: thuat lanh ((y tang) OR (ky tang)) mai hoi. hieu van ((cham h'roi) or (cam lo)) va tinh tai cua tre*.