Perhaps you should try some spelling variations:
hanh tai » thanh tai, hang tai, han tai
cau tren » dau tren, ca tren, cau treo
tang mai » tang ma, tang tai, lang mai
mai khoi » mai khoa, tai khoa, cac khoi
hieu van » hieu va, thien van, lieu va
van cham » van chat, van tham, va cham
cham loc » cham soc, chon loc, cham o
tu sach » thu sach, su sach, te sach
hanh va » hang va, hanh vi
sach ky » sac ky, sach y, sach ty
ky tang » ky nang, ky dang, kho tang
cu tren » tu tren, dua tren
loc va » hoc va, luc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: tu sach ky tang mai khoi. hieu van cham loc va ((hanh tai) or (hanh va)) ((cau tren) or (cu tren))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ky tang mai khoi. hieu van cham loc va ((hanh tai) OR (hanh va)) ((cau tren) OR (cu tren)).
• Adding a wildcard symbol may retrieve word variants: tu sach ky tang mai khoi. hieu van cham loc va ((hanh tai) or (hanh va)) ((cau tren) or (cu tren))*.