Perhaps you should try some spelling variations:
cua triet » cua viet, su triet, va triet
dung sai » dung tai, dung va, dung dat
dua tren » dung tren
su sach » so sach, vu sach
sach ty » sach y, sach tu, sach thu
ty nang » ky nang, ty xang, ty hang
cao hoc » co hoc, cho hoc, chat hoc
hieu he » hieu ve, hiem he, hieu le
thu xec » thu xac
he nam » ha nam, nghe nam

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

• Performing a fuzzy search may retrieve terms with similar spellings: su sach ty nang cao hoc. hieu he nam ((thu xe) or (thu xec)) dung sai ((dua tren) or (cua triet))~.
• If you are trying to use Boolean operators, they must be ALL CAPS: su sach ty nang cao hoc. hieu he nam ((thu xe) OR (thu xec)) dung sai ((dua tren) OR (cua triet)).
• Adding a wildcard symbol may retrieve word variants: su sach ty nang cao hoc. hieu he nam ((thu xe) or (thu xec)) dung sai ((dua tren) or (cua triet))*.