Perhaps you should try some spelling variations:
thuat lanh » thuat lap, thuat san
trinh tai » trinh toan, trinh tu, trinh han
tinh tai » tinh thai, tinh hai, hinh tai
cua tre » cua te, cuu tre, cua triet
hieu va » lieu va, hieu qua
tang ma » mang may, tang van
lanh y » anh y, hanh y, lanh lay
cam lo » nam lo, cam ly, cam o
ma hoi » mai hoi, xa hoi, ma hoa
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 ma hoi. hieu va ((cham h'roi) or (cam lo)) va ((tinh tai) OR (trinh tai)) cua tre~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thuat lanh y tang ma hoi. hieu va ((cham h'roi) OR (cam lo)) va ((tinh tai) OR (trinh tai)) cua tre.
• The words AND, OR and NOT may confuse the search; try adding quotes: "thuat lanh y tang ma hoi. hieu va ((cham h'roi) or (cam lo)) va ((tinh tai) OR (trinh tai)) cua tre".
• Adding a wildcard symbol may retrieve word variants: thuat lanh y tang ma hoi. hieu va ((cham h'roi) or (cam lo)) va ((tinh tai) OR (trinh tai)) cua tre*.