Perhaps you should try some spelling variations:
su triet » su viet, su tien, ve triet
tu sach » thu sach, su sach, te sach
ky lang » ky dang, ky tang, tay lang
dan dai » dat dai, can dai, dan dat
ve cam » ve cham, va cam, ve cai
ve cac » va cac, vien cac
xa dan » ca dan, xa dai, va dan
dai su » dai sua, dai so, dan su

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 lang) or (ky nang)) xa hoi. hieu ((ve cam) or (ve cac)) tuc xa dan dai su triet~.
• If you are trying to use Boolean operators, they must be ALL CAPS: tu sach ((ky lang) OR (ky nang)) xa hoi. hieu ((ve cam) OR (ve cac)) tuc xa dan dai su triet.
• Adding a wildcard symbol may retrieve word variants: tu sach ((ky lang) or (ky nang)) xa hoi. hieu ((ve cam) or (ve cac)) tuc xa dan dai su triet*.