Perhaps you should try some spelling variations:
trinh tai » trinh toan, trinh tu, trinh han
toc sach » hoc sach, doc sach, thuoc sach
tinh tai » tinh thai, tinh hai, hinh tai
cam truc » cau truc, nam truc, lam truoc
truc may » tren may, truc va
ky dang » ky nang, ky danh
hieu va » lieu va, hieu qua
va cam » va cham, va cac, va cao
ky anh » ky danh, ly anh, ty anh
cua te » cua tu

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

• Performing a fuzzy search may retrieve terms with similar spellings: toc sach ((ky dang) or (ky anh)) xa hoi. hieu va cam truc may ((tinh tai) OR (trinh tai)) cua te~.
• If you are trying to use Boolean operators, they must be ALL CAPS: toc sach ((ky dang) OR (ky anh)) xa hoi. hieu va cam truc may ((tinh tai) OR (trinh tai)) cua te.
• The words AND, OR and NOT may confuse the search; try adding quotes: "toc sach ((ky dang) or (ky anh)) xa hoi. hieu va cam truc may ((tinh tai) OR (trinh tai)) cua te".
• Adding a wildcard symbol may retrieve word variants: toc sach ((ky dang) or (ky anh)) xa hoi. hieu va cam truc may ((tinh tai) OR (trinh tai)) cua te*.