Perhaps you should try some spelling variations:
trinh tai » trinh toan, trinh tu, trinh han
thu sach » tu sach, thuat sach, thuoc sach
nang tai » hang tai, tang tai, sang tai
va trinh » van trinh, va tinh, lap trinh
dua tren » dung tren
cua viet » ca viet, hoa viet, cua vat
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
tai hoi » tai khoi, dai hoi, tai hai
hieu ve » hieu va, hieu van
cam luc » cam xuc, cau luc
ve cam » ve cham, ve cac, va cam
luc va » duc va, tuc va, loc va

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

• Performing a fuzzy search may retrieve terms with similar spellings: thu sach ty nang tai hoi. hieu ve cam luc va trinh tai ((dua tren) or (cua viet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: thu sach ty nang tai hoi. hieu ve cam luc va trinh tai ((dua tren) OR (cua viet)).
• Adding a wildcard symbol may retrieve word variants: thu sach ty nang tai hoi. hieu ve cam luc va trinh tai ((dua tren) or (cua viet))*.